As a falling object's gravitational potential energy decreases:
a. its kinetic energy decreases.
b. its kinetic energy increases.
c. its total mechanical energy increases.
d. its kinetic energy remains the same.
e. it falls more slowly.
b
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A hollow aluminum shaft (G 5 27 GPa, d2 5 96 mm, and d1 5 52 mm) has an angle of twist per unit length of 1.88/m due to torques T. The resulting maximum tensile stress in the shaft is approx-imately:
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(D) 58 MPa
The energy required to move an electron in a hydrogen atom from energy level 1 to energy level 2 is:
A) 10.2 eV. B) 12.1 eV. C) 12.75 eV. D) 13.1 eV. E) 13.6 eV.
After an apple pie is taken from an oven, the pie filling is hotter than the crust due to
A) water in the filling that better retains thermal energy. B) uneven temperatures. C) high conductivity of apples.
A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about
A) 1.1 m/s. B) 1.5 m/s. C) 2.5 m/s. D) none of the above